Display screen or portion thereof with a graphical user interface



FIG. 1 is a front view of a first embodiment of a display screen or portion thereof with a graphical user interface showing our new design;

FIG. 2 is a front view of a second embodiment thereof;

FIG. 3 is a front view of a third embodiment thereof;

FIG. 4 is a front view of a fourth embodiment thereof;

FIG. 5 is a front view of a fifth embodiment thereof;

FIG. 6 is a front view of a sixth embodiment thereof;

FIG. 7 is a front view of a seventh embodiment thereof;

FIG. 8 is a front view of an eighth embodiment thereof;

FIG. 9 is a front view of a ninth embodiment thereof;

FIG. 10 is a front view of a tenth embodiment thereof;

FIG. 11 is a front view of an eleventh embodiment thereof;

FIG. 12 is a front view of a twelfth embodiment thereof;

FIG. 13 is a front view of a thirteenth embodiment thereof; and,

FIG. 14 is a front view of a fourteenth embodiment thereof.

The outer broken lines showing a display screen or portion thereof form no part of the claimed design. The remaining broken lines showing portions of the graphical user interface form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface, as shown and described. 